class_docstr: Simple version FMM(Forward Maximun Matching) word tokenizer. This tokenizer can only
  be used in topic model demo, but not in real business application scenarios.
  
  Notes: This tokenizer can only recognize the words in the corresponding vocab file.
class_docstr_tok: ["Simple","version","FMM","(","Forward","Maximun","Matching",")","word","tokenizer",".","This","tokenizer","can","only","be","used","in","topic","model","demo",",","but","not","in","real","business","application","scenarios",".","Notes",":","This","tokenizer","can","only","recognize","the","words","in","the","corresponding","vocab","file","."]
docstr: Return the lowercase character of the corresponding character, or return
  the original character if there is no corresponding lowercase character.
docstr_tok: ["Return","the","lowercase","character","of","the","corresponding","character",",","or","return","the","original","character","if","there","is","no","corresponding","lowercase","character","."]
code: def __tolower(self, c):
      """Return the lowercase character of the corresponding character, or return
      the original character if there is no corresponding lowercase character.
      """
      return c.lower()
  
file_path: PaddleHub/modules/text/language_model/lda_news/tokenizer.py
label_desc: Use image node_id 6 for calling the SimpleTokenizer obj's underlying member method code with example usage: obj.__tolower(c) and returns: c